<div class='user_solution'><span style="text-align:justify;display:block;" class="MsoNormal"><b>1.a6! </b></span> <span style="text-align:justify;display:block;" class="MsoNormal">1.c7? Nf5+! 2.Bxf5 Ne4+ 3.Kf4 Nd6 4.a6 Nc8= <i>(4...Ne8? 5.c8N?)</i></span> <span style="text-align:justify;display:block;" class="MsoNormal"><i> </i></span> <span style="text-align:justify;display:block;" class="MsoNormal"><b>1...Nf5+ 2.Kf2 Ne6 3.Bxe6 </b></span> <span style="text-align:justify;display:block;" class="MsoNormal">3.a7? Nc7 4.Bxf5 Na8=</span> <span style="text-align:justify;display:block;" class="MsoNormal"> </span> <span style="text-align:justify;display:block;" class="MsoNormal"><b>3...Nd6 4.a7 Nc8! </b></span> <span style="text-align:justify;display:block;" class="MsoNormal">4...Ne8? 5.a8N Nc7 6.Nb6 Nxe6 7.Kg3 mate in 15 moves</span> <span style="text-align:justify;display:block;" class="MsoNormal"> </span> <span style="text-align:justify;display:block;" class="MsoNormal"><b>5.a8N! Ne7</b>/a7 </span> <span style="text-align:justify;display:block;" class="MsoNormal">5...Nb6? 6.Nc7 Nd5 7.Nb5 mate in 15 moves</span> <span style="text-align:justify;display:block;" class="MsoNormal"> </span> <span style="text-align:justify;display:block;" class="MsoNormal"><b>6.c7 Nc8 7.Ke3! Nb6 8.Kd4! Nc8 9.Bg8! Nb6 10.c8Q/R/N Nxc8 11.Nc7 Nd6! </b></span> <span style="text-align:justify;display:block;" class="MsoNormal">11...Ne7? 12.Ne6 Nxg6 13.Nd8 Ne5 14.Kxe5 mate in 16 moves</span> <span style="text-align:justify;display:block;" class="MsoNormal"> </span> <span style="text-align:justify;display:block;" class="MsoNormal"><b>12.Ne6 Ne4 13.Nd8 Ng5 14.Nf7+ Nxf7 15.gxf7 g6 16.f8Q g5 17.Qf6# </b></span> <span style="text-align:justify;display:block;" class="MsoNormal"><span style="font-family: &quot;FigurineCB AriesSP&quot;;"> </span></span></div>